OMAP: DSS2: DSI: use a private workqueue

Using the shared workqueue led to to a deadlock in the case where the
display was unblanked via keyboard.

What happens is something like this:

- User presses a key

context 1:
- drivers/char/keyboard.c calls schedule_console_callback()
- fb_unblank takes the console semaphore
- dsi bus lock is taken, and frame transfer is started (dsi bus lock is
  left on)
- Unblank code tries to set the panel backlight, which tries to take dsi
  bus lock, but is blocked while the frame transfer is going on

context 2, shared workqueue, console_callback in drivers/char/vt.c:
- Tries to take console semaphore
- Blocks, as console semaphore is being held by context 1
- No other shared workqueue work can be run

context 3, HW irq, caused by FRAMEDONE interrupt:
- Interrupt handler schedules framedone-work in shared workqueue
- Framedone-work is never ran, as the shared workqueue is blocked. This
  means that the unblank thread stays blocked, which means that context 2
  stays blocked.

While I think the real problem is in keyboard/virtual terminal code, using
a private workqueue in the DSI driver is perhaps safer and more robust
than using the shared one. The DSI works should not be delayed more than a
millisecond or so, and even if the private workqueue gives us no hard
promise of doing so, it's still safer bet than the shared workqueue.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@nokia.com>

1 files changed, 20 insertions, 2 deletions

diff --git a/drivers/video/omap2/dss/dsi.c b/drivers/video/omap2/dss/dsi.c
index 542c6e2a3ff1..de3fdab46f38 100644
--- a/drivers/video/omap2/dss/dsi.c
+++ b/drivers/video/omap2/dss/dsi.c
@@ -238,6 +238,8 @@ static struct
 
         bool te_enabled;
 
+        struct workqueue_struct *workqueue;
+
         struct work_struct framedone_work;
         void (*framedone_callback)(int, void *);
         void *framedone_data;
@@ -2759,6 +2761,7 @@ static void dsi_update_screen_dispc(struct omap_dss_device *dssdev,
         unsigned packet_payload;
         unsigned packet_len;
         u32 l;
+        int r;
         const unsigned channel = dsi.update_channel;
         /* line buffer is 1024 x 24bits */
         /* XXX: for some reason using full buffer size causes considerable TX
@@ -2809,8 +2812,9 @@ static void dsi_update_screen_dispc(struct omap_dss_device *dssdev,
 
         dsi_perf_mark_start();
 
-        schedule_delayed_work(&dsi.framedone_timeout_work,
+        r = queue_delayed_work(dsi.workqueue, &dsi.framedone_timeout_work,
                         msecs_to_jiffies(250));
+        BUG_ON(r == 0);
 
         dss_start_update(dssdev);
 
@@ -2841,6 +2845,11 @@ static void dsi_framedone_timeout_work_callback(struct work_struct *work)
 
         DSSERR("Framedone not received for 250ms!\n");
 
+        /* XXX While extremely unlikely, we could get FRAMEDONE interrupt after
+         * 250ms which would conflict with this timeout work. What should be
+         * done is first cancel the transfer on the HW, and then cancel the
+         * possibly scheduled framedone work */
+
         /* SIDLEMODE back to smart-idle */
         dispc_enable_sidle();
 
@@ -2873,6 +2882,7 @@ static void dsi_framedone_timeout_work_callback(struct work_struct *work)
 
 static void dsi_framedone_irq_callback(void *data, u32 mask)
 {
+        int r;
         /* Note: We get FRAMEDONE when DISPC has finished sending pixels and
          * turns itself off. However, DSI still has the pixels in its buffers,
          * and is sending the data.
@@ -2881,7 +2891,8 @@ static void dsi_framedone_irq_callback(void *data, u32 mask)
         /* SIDLEMODE back to smart-idle */
         dispc_enable_sidle();
 
-        schedule_work(&dsi.framedone_work);
+        r = queue_work(dsi.workqueue, &dsi.framedone_work);
+        BUG_ON(r == 0);
 }
 
 static void dsi_handle_framedone(void)
@@ -3292,6 +3303,10 @@ int dsi_init(struct platform_device *pdev)
         mutex_init(&dsi.lock);
         sema_init(&dsi.bus_lock, 1);
 
+        dsi.workqueue = create_singlethread_workqueue("dsi");
+        if (dsi.workqueue == NULL)
+                return -ENOMEM;
+
         INIT_WORK(&dsi.framedone_work, dsi_framedone_work_callback);
         INIT_DELAYED_WORK_DEFERRABLE(&dsi.framedone_timeout_work,
                         dsi_framedone_timeout_work_callback);
@@ -3328,6 +3343,7 @@ int dsi_init(struct platform_device *pdev)
 err2:
         iounmap(dsi.base);
 err1:
+        destroy_workqueue(dsi.workqueue);
         return r;
 }
 
@@ -3335,6 +3351,8 @@ void dsi_exit(void)
 {
         iounmap(dsi.base);
 
+        destroy_workqueue(dsi.workqueue);
+
         DSSDBG("omap_dsi_exit\n");
 }